Matter cannot be created nor destroyed, only moved, displaced, changed into energy; or morphed into a new state....All four just happened...
In the heart of the Pacific Ocean, an all out invasion-turned gang-war occurred without warning between the two largest factions of the planet's kaiju population. As all hell is breaking loose on Solgell Island, the Global Defense Force see an opportunity to test a new superweapon, trying to rid the world of some of mankind's biggest threats while they are all clustered together. As the faction leaders unleashed their most devastating attacks, Dimension Tide fired and the combined energy seemed to erase some of the factions' power players off the map.But, as the world cheered or bowed their heads in loss, none of them took a moment to realize Dimension Tide's blast, long believed to be an artificial black hole; behaved nothing like what theoretical physicists believed it should.Six of the most powerful beings on the planet weren't crushed, imprisoned, or vaporized; they were moved.Moved, changed, shrunk; but still very much alive. Equestria just got six new denizens just as a horror from the kaiju home realm sets its sights on Harmony's world.Readable here, though the story is still on-going and not yet complete.Secondary coverart here◊The Bridge is crossover fiction between My Little Pony: Friendship Is Magic and Godzilla written by Tarbtano. The fanfic is currently in progress (latest chapter posted as of 8/26/2014), marked as incomplete currently with fourteen chapters (12 normal chapters, a bonus chapter, and a One-shot) and one Q&A section published.
Alternate Continuity: The author made up a new universe that the kaiju hail from, which he's dubbed the 'Amalgam Universe'. It uses the Heisei Godzilla series as the base, but neatly ties in the Rebirth of Mothra trilogy, Pacific Rim, most of the Millennium age Godzilla series, the Legendary Pictures reboot, the Heisei Gamera series; and numerous single movie kaiju names both from Toho and other company's. All with alot of continuity mixing between franchises, with some changes that still make alot of sense (for instance, Gamera is retooled into a Guardian Monster from Godzilla, Mothra, King Ghidorah: Giant Monsters All-Out Attack!, replacing Mothra, who already existed). The full timeline is viewable here
Ambiguously Evil: Xenilla is an odd card to read. On one hand he had no qualms about destroying half a human city in his first outing and nearly killed Godzilla Senior twice. On the other hand he is not Chaotic Evil or needlessly destructive, having spared both Fluttershy and the toddler aged Godzilla Junior both times he first met them
Attack of the 50-Foot Whatever: Both villanous and heroic example (right after each other no less!). Garble and his gang experience greed growth and rapidly change into full size dragons. Cue an injured Rainbow Dash inadvertently causing Anguirus to revert to his true form to save the day.
Bad Dreams: Mothra is plagued by them because thanks to Genetic Memory she knows how it looked and felt when Godzilla Senior tore her father's throat out. She sometimes gets nightmarish flashbacks from Battra's POV whenever she looks at Junior or Xenilla. Just look at them!
Authority Equals Asskicking: Princesses of Equestria, Luna and Celestia on the Equestrian side; and King of the Monsters, Godzilla on the Kaiju side
Badass Normal: To an extent, Anguirus. He is the only member of the featured kaiju cast without any projectile weapons though this is subverted in a purely powers sense as he does have the Canon Immigrant ability from the console video-games to superheat his spines.
Badass Princess: Crash through her roof, beat down half her and her sister's guards; and you'll soon be questioning why Princess Luna even needed guards in the first place. She actually managed to knock out the ponified Godzilla before fainting from her injuries
Benevolent Boss: Villainous example. The Bigger Bad gets the loyalty of numerous evil kaiju not only by a show of force, but by offering and giving them exactly what they wanted most. Most pledged their service without hesitation
On the positive side, Godzilla junior is considered the 'king' of the terran kaiju, who follow him out of well earned loyalty and respect. He and his highest ranking subordinates are genuine friends
Bigger Bad: Many readers at first assumed Xenilla and Destroyah were the main villains of the story. Then when Red was introduced a lot of them thought he would be the main villain. Turns out it's the being haunting Xenilla's nightmares and defeated Red before taking over Zenith. Though unnamed, some readers are speculating it's Bagan
Canon Immigrant: Hokmuto makes an appearance in the bonus chapter. The movie came out when the story was being written, and readers liked the character so much that Tarbtano gave him an extended cameo and fight scene.
Curb-Stomp Battle: Pit one of the most tanky and seasoned veteran fighters amongst Terra's native kaiju against a half dozen slightly smaller, inexperienced, and less durable dragons; and you can guess what happened when Anguirus after reverting to his full form thanks to Rainbow Dash intervened against the greed grown versions of Garble's gang
Cliff Hanger: Almost all of the chapters end on this to varying degrees.
Tarbtano (when asked why): Because I'm evil and the devil made me do it
Continuity Nod: Even though this is a Massive Multiplayer Crossover, this is set after a largely unchanged Heisei series timeline with the grown up Godzilla Junior as the current Godzilla. This explains his calmer and gentler personality, so long as he isn't attacked; unlike the neutral or evil incarnations of the character
Cute Mute: Gentle Leaf is adorable enough to make Anguirus act protective over her.
Cool Big Sis: Mothra is this in general towards her kaiju allies and is rapidly becoming this to Twilight
Designated Girl Fight: Downplayed and subverted significantly as multiple battles were present before it with gender as an afterthought, but the first kaiju on kaiju rumble in Equestria is Mothra vs. Gyaos
Divine Intervention: A currently unnamed being, more or less implied to be a spirit or deity, is the one who converses with and sends King Caesar back into Equestria's past.
Considering Mothra's mythical status, she coming to Twilight's aid could arguably count.
The Dragon: It's shown so far Destroyah plays this role to Xenilla, albeit begrudgingly at best. Subverted as though they start out evil and are certainly not kind, they don't seem to be the villains of the story.
Dumb Muscle: Megalon who's basically the Kaiju equivalent of Derpy Hooves.
Everything Is Better With Princesses: Xenilla doesn't think so. Though he respects Celestia and Luna's power, he thinks they still calling themselves princesses and not Queens is ridiculous. Upon finding out the ruler of the Crystal Empire was another Princess, he was down right dumbstruck and couldn't proceed without asking Cadance what was up with the titles. Hilariously, no one could give him an answer as they apparently never gave it thought.
Evil Counterpart: Xenilla plays this straight to Godzilla junior at least in the latter's eyes. Some interaction makes it seem like Xenilla is more of an Anti-villain than the straight up monster Godzilla thinks he is
Evil Detecting Kaiju: When King Sombra in his shadow form infiltrates the Crystal Empire, Xenilla can sense him and instantly knows he is a malign threat.
King Caesar didn't hesitate for a moment to prepare for battle when first meeting Tirek
Evil Power Vacuum: With Xenilla and Destroyah in Equestria, their faction has turned on each other, fighting for control.
Evil vs. Evil: Red, demonic murderer who indulges in torture vs. the story's still unnamed villain, a cold and calculating destroyer. Red would have won if the fight continued longer, but was outnumbered and forced through a portal into an unknown dimension
Lesser example would be the short duel between Monster X and Grand King Ghidorah. It's quite clear those two do NOT like each other even if they are technically on the same side now.
Expy: Because most of the kaiju only get hints of their personality in the source material, Tarbtano gave them all some traits to fill in the blanks. The result is minor cases of this underneath the source material, though thankfully in a tactful way that doesn't turn into Captain Ersatz
Genetic Memory: Xenilla, being a mutated clone of Godzilla senior, starts getting some memories from his 'father' in his dreams
Mothra has this too, having some of the memories of all her predecessors (mother, grandmother, etc) as well as her 'father' Battra
Insistent Terminology: Xenilla insists on calling Cadence "Empress" no matter how many times she corrects him, since he can't wrap his head around the idea of a Princess ruling an empire. Poor Shining Armor, as a non-royal who married into the monarchy, can't get him to stop calling him "Consort".
Xenilla: I'm eager to see this.. crystal empire of yours, Empress.
Xenilla: Considering the architecture of your land Consort-
Shining Armor: Prince
Xenilla: -Prince Consort
Kaiju: No really, read the premise and take a wild guess what's in the story...
Laser-Guided Amnesia: Monster X can't seem to remember a single thing about him prior to getting to the state he is in now, outside of some nightmarish still images.
Landing in Someone's Bathtub: Inverted. The mass teleportation spell to bring both the converted kaiju and Elements of Harmony to the throne room teleports in Rarity while she's still bathing, bathtub and all
Rodan: Oh look a white one
Rarity: *covering herself with shower curtain* WHAT IN THE NAME OF CELESTIA?!
Legacy Character: Two of the most notable Good Kaiju are this. Mothra Leo has a lineage including her mother, the Heisei Mothra, and dozens of other Mothra in the past
Godzilla Junior has both his adoptive father Senior (the Heisei incarnation), and the 1954 incarnation all being his predecessors by the same name.
Legion of Doom: The Bigger Bad has assembled a multiple-franchise-spanning army of evil kaiju. If the latest chapter is anything to go by, MLP villains will be joining the roster as well
Living Lie Detector: Both Applejack, fitting her element of honesty, and to a lesser extent the Albino Hyper Gyaos seem to be able to pull this off
Make Me Wanna Shout: Celestia putting her hoof down borders on this trope. And you thought Luna's Royal Canterlot voice was loud! When Celestia raises her voice, half the glass in the palace broke
Anguirus is in the same league when in his full form. His roar at point blank range is enough to rupture a dragon's eardrums and stun it
Massive Multiplayer Crossover: In addition to Toho's creations, numerous kaiju owned by other companies make appearances, ranging from Legendary Picture's Pacific Rim Kaiju, to Daiei's Gyaos and Legion; to Yonggu-Art's Yonggary. In addition, some of the fan made Equestrian characters from the story's readers and other groups on Fimfiction make cameos.
Morality Pet: The Cutiemark Crusaders are becoming this to Destroyah. While the latter party barely pays them any attention, the fact whom we are talking about has since never tried to harm them speaks volumes. They even managed too, much to all the kaiju's surprise; calm down the giant mare right when she was about to throw it down with Celestia.
Mythology Gag: As a joke on their company's rivalry, the Toho kaiju use the word 'Daiei' in place of the word 'hell'; and the Daiei kaiju use 'Toho' for the same word
Godzilla: Lady, what the Daiei are you doing?
Nice Job Fixing It, Villain: Destroyah pulls this, albeit completely unintentionally, when she attacks the Timberwolf pack about to kill the Cutiemark Crusaders.
Noble Demon: Xenilla, when compared to his second in command. He has his goals, but won't act out for the sake of destruction unless he sees the need too. He at least had the decency not to blow up Fluttershy's cottage upon crash landing inside it. Being on the receiving end of 'the stare' helps.
Monster X plays this trope in spades, killing several of Legion's soldiers for attacking a pony who couldn't hope to fight back, and even bandaging said pony up before ditching him
Noodle Incident: On both franchises no less. The alien kaiju reference but refuse to talk about some sort of "Radio incident with the Kilaaks", and the Equestrians bring up some destructive event only referred to the "Chocolate Milk accident". What exactly happened beyond anyone.
No Sell: Dragons would have more luck shooting Anguirus with a water hose than they would using their fire. Displayed spectacularly by Anguirus casually walking through a massive cone of fire completely unfazed. He IS a 'fire monster' after all
Partial Transformation: The Kaiju turned Equestrian characters retain some physical traits and their now diminished powers. This is shown best by Destroyah (now massive pegasus mare) still having her horn, causing many characters and readers alike to mistake her for an alicorn.
Played up with horrifying implications when more kaiju are sent to Equestria with fewer and fewer changes.
Princesses Rule: Equestria's extensive use of this is lampshaded when Xenilla points out that, as ruler of the Crystal Empire, Cadence should be referred to as "Empress". When he questions why this isn't the case, none of the ponies he asks can answer — apparently, the thought never occurred to them.
Red Eyes, Take Warning: The only feature an injured pony can see as a hooded figure (Monster X) looms over them is it's glowing red eyes. Subverted as the figure just saved them from several Symbiotic Legion and even bandaged them up due to an honor code, so the being meant them no harm.
Running Gag: The characters of the two franchises use some of their principle creators' names whenever they say 'God'.
The ponies say "Faust" and "Bonnie", referencing Lauren Faust and Bonnie Zacherle, the principle concept creators for Friendship is Magic and My Little Pony respectively.
The kaiju roster says "Tanaka", referencing Tomoyuki Tanaka, one of the creators of the kaiju genre and the producer on almost all of Toho's monster films up until his death in the late 90s.
Samus Is a Girl: Several readers reacted like this when Destroyah was labeled female. The author went into detail in the Q&A why this is so
A much lighter example would be a small jab at Hasbro for making every benign female ruler under Celestia's sun "Princess ___". Xenilla points out the oddity of Princess Cadance ruling the Crystal Empire, thoroughly confused why she isn't an empress.
The Reveal: The last paragraph of the bonus chapter is notable for this, as it reveals two previously unnamed characters. The first Monster X, appeared in an earlier chapter and was even the protagonist of the bonus chapter; going unnamed the entire time up until the last portion. The other was Gigan, whom X had crossed paths with and despite the two holding a conversation, he also was not revealed until the end.
Wonder Twin Powers: Celestia and Luna's magical prowess is much stronger when they are near each other. They are still powerhouses when alone, but being anywhere near one another increases their power by magnitudes.
Worf Effect: The Bigger Bad establishes himself as the more dangerous or crafty of the villains by defeating long time fandom Big Bads Grand King Ghidorah and Red.
You Are in Command Now: After the main kaiju were transported to Equestria, control of Godzilla's faction fell to Gamera, who's acting as "Regent" in light of the "King's" absence.
You Can't Return To Your Realm: The situation with the first six kaiju that arrive. Dimension Tide brought them to Equestria and magic might be able to get them back, but for now they are stuck there. Mothra and Twilight are working on averting this.